a trend toward significancep = 0.06
However, excluding from the analyses patients with luminal A or luminal B/HER2-negative tumors (a group of patients with favorable outcome, representing 51.9 % of the entire study population), pCR resulted predictive of better DRFS ( p = 0.028: HR = 0.37, 95 % CI = 0.19–0.72) with a trend toward significance for OS ( p = 0.06; HR = 0.34, 95 % CI = 0.16–0.77) (Fig. 1 a, b).